Kingley Vale, Sussex, United Kingdom: Some of the twisted and ancient yew trees on this 204.4-hectare site date back at least 2,000 years.
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Fairy Chimneys, Turkey: A geological marvel, these unusual rock formations are the result of the surrounding, softer rock eroding over thousands of years.
Giant's Causeway, Northern Ireland: Formed 50 to 60 million years ago, the Giant's Causeway became Northern Ireland's first World Heritage Site in 1986.
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Moeraki Boulders, New Zealand: Scattered along Koekohe Beach, these two-meter-high stones were created by mudstone hardening over five million years.
Great Blue Hole, Belize: Measuring 300 meters wide and around 125 meters deep, this huge underwater sinkhole is part of the Belize Barrier Reef System.
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Cano Cristales, Colombia: Often referred to as the "River of Five Colors," the waters of Cano Cristales become an explosion of bright colors between Colombia's wet and dry seasons.
Dead Vlei, Namibia: One of the most intriguing places in Namibia,Dead Vlei sits among the tallest sand dunes in the world, with some as high as 400 meters.
Chocolate Hills, Philippines: Legend has it these 1,268 hills in the Bohol province of the Philippines are the dried tears of a heartbroken giant.
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Kilauea, Hawaii: Not only is Kilauea the most active volcano on the island of Hawaii, it's also one of the most active in the world.
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Lake Hillier, Australia: This saline lake on the edge of the largest island in the Recherché Archipelago, is fame for its pink water, thought to be caused by the combination of algae and a high concentration of salt.
Devils Tower, Wyoming: Rising some 385 meters above the Belle Fourche River, this national monument is sacred to several Native American tribes.
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Dallol, Ethiopia: With temperatures averaging at around 94 degrees Fahrenheit, Dallol is the hottest place on the planet.
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The Eye of the Sahara, Mauritania: Also known as the Richat Structure, this 40-kilometer wide geological marvel is visible from space.
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Snow Monsters, Mount Zao, Japan: Situated high in Japan's northern Tohoku region, these snow creatures, or "juhyu," are accessible by cable car.
Valley of the Moon, Argentina: This remote valley, also known as the Ischigualasto Provincial Park, is based in a protected area of the South American country.
Vermilion Cliffs, Arizona: Spanning the Utah-Arizona border, Vermilion Cliffs is one of the most visually stunning places in the United States.
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Haukadalur geothermal field, Iceland: Situated 60 kilometers east of Reykjavik, the oldest account of the geothermal fields here date back to 1294.
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Trollkirka Caves, Norway: One of Norway's longest limestone caves, the majestic Trollkirka has been carved out by the water over thousands of years.
Bryce Canyon, Utah: While it's much less popular than nearby Grand Canyon National Park, Bryce Canyon is arguably just as impressive.
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Dead Sea, Israel/Jordan: Positioned between Jordan (pictured here) and Israel, the Dead Sea is more than nine times saltier than the sea.
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Spotted Lake, Canada: This unusual lake is considered sacred by the natives of the Okanagan Valley.
Blood Falls, Antarctica: This incredible natural phenomenon was discovered by Australian geologist Griffith Taylor in 1911.
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Zhangye Danxia Landform Geological Park, China: Known as the "Rainbow Mountains," these colorful rock formations are the result of millions of years geological activity.
Darvaza Gas Crater, Turkmenistan: Dubbed the Door to Hell by locals, this natural phenomenon was brought about by man less than half a century ago.